Matthew White
I think it's different strokes for different folks when it comes to multiphonics. In the right context I think its a great tool to have.
I thought the low range White displayed on that clip was amazing. My kids would call what he was doing a form of "beat boxing". I know if you surf youtube you will find all sorts of people trying it on a variety of instruments.
I thought it was a bit redunant, but heck who am I to criticize a low end like that?
Euphs:
Miraphone 5050 Ambassador
Wessex Travel (Tornister) Euphonium 'Maly' ER154
Yamaha 201 Baritone
Mp: Wick SM4 Ultra X
Groups:
The San Diego Concert Band